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Message-ID: <742074.028446467-sendEmail@localhost>
Date: Sun, 30 Apr 2017 09:13:23 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: imageworsener: heap-based buffer overflow in iw_process_cols_to_intermediate (imagew-main.c)
Description:
imageworsener is a utility for image scaling and processing.
The complete ASan output of the issue:
# imagew $FILE /tmp/out -outfmt bmp
==20314==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fe233b99af8 at pc 0x7fea7f55da64 bp 0x7ffdb4737840 sp 0x7ffdb4737838
WRITE of size 4 at 0x7fe233b99af8 thread T0
#0 0x7fea7f55da63 in iw_process_cols_to_intermediate /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:903:75
#1 0x7fea7f55da63 in iw_process_one_channel /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:1144
#2 0x7fea7f54ca71 in iw_process_internal /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:1405:7
#3 0x7fea7f520095 in iw_process_image /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:2248:8
#4 0x528de1 in iwcmd_run /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:1400:6
#5 0x515326 in iwcmd_main /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:3018:7
#6 0x515326 in main /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:3067
#7 0x7fea7e5e878f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#8 0x41b028 in _init (/usr/bin/imagew+0x41b028)
0x7fe233b99af8 is located 4 bytes to the right of 8003134196-byte region [0x7fe056b37800,0x7fe233b99af4)
allocated by thread T0 here:
#0 0x4da6f8 in malloc /tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.0/work/compiler-rt-4.0.0.src/lib/asan/asan_malloc_linux.cc:66
#1 0x551fc0 in my_mallocfn /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:794:9
#2 0x7fea7f6a39ae in iw_malloc_ex /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-util.c:48:8
#3 0x7fea7f6a3dec in iw_malloc_large /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-util.c:77:9
#4 0x7fea7f54c5a0 in iw_process_internal /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:1396:44
#5 0x7fea7f520095 in iw_process_image /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:2248:8
#6 0x528de1 in iwcmd_run /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:1400:6
#7 0x515326 in iwcmd_main /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:3018:7
#8 0x515326 in main /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:3067
#9 0x7fea7e5e878f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
SUMMARY: AddressSanitizer: heap-buffer-overflow /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-main.c:903:75 in iw_process_cols_to_intermediate
Shadow bytes around the buggy address:
0x0ffcc676b300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc676b310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc676b320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc676b330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffcc676b340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ffcc676b350: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04[fa]
0x0ffcc676b360: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffcc676b370: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffcc676b380: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffcc676b390: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ffcc676b3a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==20314==ABORTING
Affected version:
1.3.0
Fixed version:
1.3.1
Commit fix:
https://github.com/jsummers/imageworsener/commit/86564051db45b466e5f667111ce00b5eeedc8fb6
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8325
Reproducer:
https://github.com/asarubbo/poc/blob/master/00269-imageworsener-heapoverflow-iw_process_cols_to_intermediate
Timeline:
2017-04-12: bug discovered and reported to upstream
2017-04-12: upstream released a patch
2017-04-27: blog post about the issue
2017-04-29: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/27/imageworsener-heap-based-buffer-overflow-in-iw_process_cols_to_intermediate-imagew-main-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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